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Operational Cost Reduction in WDM Networks using Lighttours Marzo i Lázaro, Josep Lluís Caro Pérez, Luis Fernando Solano Donado, Fernando Oliveira, Jaudelice C.de Fabregat Gesa, Ramon Comunicacions òptiques Multiplexatge per divisió de freqüència Optical communications Wavelength division multiplexing Wavelength division multiplexing (WDM) networks have been adopted as a near-future solution for the broadband Internet. In previous work we proposed a new architecture, named enhanced grooming (G+), that extends the capabilities of traditional optical routes (lightpaths). In this paper, we compare the operational expenditures incurred by routing a set of demands using lightpaths with that of lighttours. The comparison is done by solving an integer linear programming (ILP) problem based on a path formulation. Results show that, under the assumption of single-hop routing, almost 15% of the operational cost can be reduced with our architecture. In multi-hop routing the operation cost is reduced in 7.1% and at the same time the ratio of operational cost to number of optical-electro-optical conversions is reduced for our architecture. This means that ISPs could provide the same satisfaction in terms of delay to the end-user with a lower investment in the network architecture 2007 info:eu-repo/semantics/article Marzo, J.L., Caro, L.F., Solano, F., de Oliveira, J.C., i Fabregat, R. (2007). Operational Cost Reduction in WDM Networks using Lighttours. 9th International Conference on Transparent Optical Networks : 2007 : ICTON '07. 1, 71 - 74. Recuperat 10 maig 2010, a http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4296033 http://hdl.handle.net/10256/2233 http://hdl.handle.net/10256/2233 eng info:eu-repo/semantics/altIdentifier/doi/10.1109/ICTON.2007.4296033 info:eu-repo/semantics/altIdentifier/isbn/1-4244-1249-8 Tots els drets reservats info:eu-repo/semantics/openAccess application/pdf IEEE © 9th International Conference on Transparent Optical Networks : 2007 : ICTON '07, 2007, vol. 1, p. 71-74 Articles publicats (D-ATC)